The large-scale bias of the hard X-ray background
Abstract
Recent deep X-ray surveys combined with spectroscopic identification of the sources have allowed the determination of the rest-frame 2-8 keV luminosity as a function of redshift. In addition, an analysis of the HEAO1 A2 2-10 keV full-sky map of the X-ray background (XRB) reveals clustering on the scale of several degrees. Combining these two results in the context of the currently favored Lambda-CDM cosmological model implies an average X-ray bias factor, b_x, of b_x^2 = 1.12 +/- 0.33, i.e., b_x = 1.06 +/- 0.16 (statistical error only) on large scales. This result is in contrast to the large biases of some previous estimates and is more in line with current estimates of the optical bias of L_* galaxies.Keywords
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